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Note O - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 11, 2016
Sixth Stock Repurchase Plan [Member]
Share Repurchase Program, Authorized, Number of Shares			1,200,000
Treasury Stock, Shares, Acquired		1,101,884
Treasury Stock, Value, Acquired, Cost Method		$ 39
Share Repurchase Program, Remaining Authorized, Number of Shares		98,116
O2024Q1 Dividends [Member]
Common Stock, Dividends, Per Share, Declared		$ 0.5
Dividends Payable, Date to be Paid		Jul. 02, 2024
Dividends Payable, Date of Record		Jun. 24, 2024
O2024Q2 Dividends [Member] \| Forecast [Member]
Common Stock, Dividends, Per Share, Declared	$ 0.5
Dividends Payable, Date to be Paid	Sep. 06, 2024
Dividends Payable, Date of Record	Aug. 26, 2024